I have a 1032x (1062x). I can align the phase using the utility menu but it doesn't track even when coupled. At 30Mhz it is off by 7 degrees and by 60Mhz it is off by 14 degrees. I can adjust the phase etc. but you can't do that easily when sweeping. Is there another setting or something I am missing? I bought it to use with the SDS 1104x-e BodeII plot function. I can fix it using PC based software to intercept the sweep setup but I bought it to avoid having to use the PC for Bode plots.
Some kind of default case. If use BodePlot so that only one generator channel is in use and signal is splitted for Ref and DUT, there need care that signal pathways travel times are equal (it need calibrate by adjusting cable lengths without DUT). Still some small phase shift depending frequency.
But then if use SDG and PB so that SDG one channel is for Ref and other cannel is for DUT.
In this case SDG is in tracking mode.
SDG [Utility] »» [CH Copy/Coupling] »» [Tack ON] (there can also adjust CH2 - CH1 PhaseDev). Usually we keep this 0 as default as it is. But it need of course understand that this is fixed phase shift, independent of frequency but with higher frequencies some error)
As you told there is other thing. Around 7° at 30MHz and around 14° at 60MHz in your case.
In my system it looks roughly around same.
It is better to think this based to time (phase debends frequency), not phase angle.
If look 7° phase shift at 33.333 ns period (30MHz) it is 0.648 ns
And 14° phase shift at 16.666 ns period (60MHz) it is 0.648 ns
This time is total time shift and may be different with different individual instruments (oscilloscope + signal generator).
Also it looks like this is not so simple. It is also not exactly fixed time, it depends bit about frequency due to many reasons.
This time error need compensate externally. Example using cables where this error is compensated using cable lengths.
After that, some residual error cannot be fully compensated in any very simple way.
In pictures.
Pictures
SDG CH1 to Ref (oscilloscope Ch1)
SDG CH2 to Dut (oscilloscope Ch2)
SDG in tracking mode.
PodePlot Log sweep, freq 500kHz - 60MHz, level
Cables M17/084 (RG223) . Oscilloscope inputs 1M (not terminated 50ohm!)
2 equal length roughly 80cm and one ~13cm longer
picture 1
Roughly equal cable lengths.
(SDG [Utility] »» [CH Copy/Coupling] »» [PhaseDev] »» CH2-CH1 PhaseDev -0°)
picture 2
Cable CH2 to Ch2 is ~13cm longer for compensate time errorAfter then there still exist some residual time error (displayed as phase error) what is bit more complex and depends freq.
(SDG [Utility] »» [CH Copy/Coupling] »» [PhaseDev] »» CH2-CH1 PhaseDev -0°)
picture 3
cables as picture 2 but then also SDG tracking PhaseDev adjusted for -5°
SDG [Utility] »» [CH Copy/Coupling] »» [PhaseDev] »» CH2-CH1 PhaseDev -5°As can see it add fixed phase shift.